| 21. | Fish gonads are typically pairs of either ovaries or testes.
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| 22. | Fewer than 300 small oocytes are produced by each gonad.
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| 23. | The gonads of hagfishes are situated in the peritoneal cavity.
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| 24. | It represents an estimate of the genetic significance of gonad radiation doses.
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| 25. | All they have is a stomach and a gonad.
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| 26. | Adults have cylindrical gonads, opening into the cloaca.
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| 27. | ? 4-Dione is produced in the adrenal glands and the gonads.
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| 28. | The gonadotropins act on the gonads, controlling gamete and sex hormone production.
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| 29. | Rhombogens contain hermaphroditic gonads developed within the axial cell.
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| 30. | They originate from primordial germ cells, which have migrated to the gonads.
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